What is 5 Axis CNC Machining?
5 Axis CNC Machining is an incredibly versatile machining process that implements subtractive machining technology. Through this process, a workpiece is cut into shape through the use of cutting tools working on 5 axes to deliver a final part. CNC machining is incredibly popular due to the high levels of accuracy, efficiency and repeatability. The process starts by utilising the original Computer-Aided Design (CAD) file to help program cutting tool paths, all managed via Computer Numerical Control (CNC). Once these tool parts have been programmed into a language that CNC machines understand, the process can then be entirely automated, meaning there are minimal manual processes.
This article highlights the features of 5-axis CNC Machining and why it differs from 3-axis or 2-axis machining, as well as noting the benefits of using a 5-axis CNC machine. Due to the greater number of axes, 5-axis milling machines have greater capabilities than its 3 and 2 axes counterparts. The machines can be configured in such a way as to reduce the need for constant supervision. Efficiency and single set up for manufactured parts are the main reasons why industries choose to implement 5 Axis CNC machining.
How does 5-axis CNC Machining work?
In CNC machining, a part is formed by using cutting tools and subtractive machining technology, which cuts away at the workpiece to form the desired shape. The shape is predetermined by the original CAD (Computer-Aided Design) file. A program is then produced in G-Code format which feeds instructions directly to the CNC machine.
Currently, it is most common for CNC Milling machines to have 3 axes to work from, X, Y and Z. However, 5-axis CNC machines use further axes, to implement into cutting process from additional angles, giving greater scope for more complicated and intricate designs. So, axes A, B and C can be introduced.
These axes work alongside X, Y and Z, in rotational angles, to deliver a 5-axis cutting machine capable of intricate designs, while still remaining a very high quality to the finished piece. The A, B and C axes move independently to the X, Y and Z in a rotating fashion. The specific configuration of the machine or CAD design determines which 2 of the 3 additional rotational axes are used. This 5-axis configuration comes at a greater cost due to the higher levels of calibration and automation technology needed to run the CNC machine and input the commands.
In terms of precision engineering technology, 5-axis machining can offer the best precision engineering solutions, and it is an industry-leading engineering process within the automotive, aerospace and medical industries to name a few.
5-Axis Machining Configurations
The 3 axes X, Y and Z work in the same fashion and calibration as a 3-axis CNC machine. The movement of the additional 2 axes working within 5-axis machining are always controlled by the CNC program inputting the instructions to the machine.
There are fundamentally two styles of CNC machining that operate with 5-axis:
A Trunnion style 5-Axis machine operates with an A-axis rotating about the X-axis, and a C-axis rotating around the Z-axis. The rotary axes are expressed via movement of the table. This type is more suited to larger work volumes, as there is no need to compensate for the space taken up by the swivelling handle.
Swivel rotate style
A swivel rotate style 5-Axis machine operates with a B axis rotating around the Y-axis, and a C-axis rotating about the Z-axis. It differs in that the table is always horizontal during the cutting process, meaning it can support heavier parts. The rotary axes are expressed by the swivelling cutting arm.
How much does 5-axis CNC Machining cost?
The cost depends on the project in hand, and the volume of parts being produced. Beyond the higher cost of purchasing a 5-axis machine, 5-axis CNC machining requires greater levels of set-up before production of a part can begin. This higher initial set-up cost during preproduction can make low volumes or one-off more expensive than equivalent parts that can be produced on a 3-axis machine.
This is understandable as 5-axis machines are by their very nature more complex and dynamic than other types of CNC machines with fewer axes. 5-axis milling machines are also more time-efficient, as they are calibrated to complete parts without any need for intervention. Usually, only one operation is needed to complete the workpiece, so downtime is dramatically reduced. Fixturing requirements are reduced, which is particularly of benefit to more organic, complex parts.
Why is there less fixturing with 5-axis CNC Machining?
The range of motion that’s achievable from the cutting head & extra rotational axes means that these machines can reach 5 sides of a part. For example, if a geometrically complex part was needed for aerospace, a 5-axis CNC machine would be the most capable machine to achieve this, due to its ability to reach complex angles and cut areas that are hard to reach, such as a compound curve.
Benefits of 5-Axis CNC Machining
Due to the advanced capabilities of a cutting tool working with 5 axes, a higher quality finish is achievable. This is because the cutting tools can be shorter on a 5-axis CNC machine. This reduces the vibration of the tool and as a result, reduced chance of “chatter” marks and ensures a smoother surface finish on the final part. The time consuming and costly need for hand finishing can be almost entirely eradicated, as 5-axis machines can closely follow contoured geometry that are traditionally harder to machine.
Due to the high speed of 5-axis machining and increased automation, there is little need for intervention or manual processes. This is commonly known as “done in one” and “one-hit machining”. The multiple axes mean the whole workpiece can be cut in one go, as opposed to the need for several operations to complete the final piece. This, in turn, results in faster output capacity.
More complex shapes can be produced
5-axis CNC Machining can produce very complex geometries. For example, machining castings and parts which include many different features would, in the past, require a multitude of setups to machine and finish the desired shape. However, with a single set up, 5-axis machining can complete a piece to its exact requirements with only one fixture in most cases.
For further information about 5-Axis CNC Machining and how it could benefit your business, contact us today. With years of expertise, we will get back to you within 24 hours with a detailed and concise quote regarding your requirements. From first contact to the safe delivery of components and fast lead times, Get It Made have got you covered.